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Compression on 1992 3 CYL/two stroke,/manual start mariner-55hp marathon

D

dunesurfer

New member
Guys,please help.I have the service manual no m-90-817643r1 for said motors.I checked compression thsi morning.All reads just over 5 bar,and all about the same.I would say,within 5 % of each other.But i cannot find the specs.What should iy be on this motors.

Thanxs in advance.

Dunes
 
5 BAR = 70 PSI--------------------------The most important thing is that all cylinders are the same and that is a good thing.----------The actual pressure is not that important.---------- It is rarely publishes as there are to many variables ---operator / battery condition / gauge calibration / amount of oil on the rings.
 
Thnxs for the reply.Sort of in the line of me thinking too.If this was with starter,i,m sure they would have been about 1-2 bars higher.Since my machines is rope start.Will have a look at the fuel pumps tomorrow,also suspect carburator gasket.
 
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